tsystem.h: Test only POSIX for availability of string.h and time.h.

	* tsystem.h: Test only POSIX for availability of string.h
	and time.h.
	* config.gcc (all systems): If USG appeared in xm_defines,
	change it to POSIX.  If both USG and POSIX appeared, just
	delete USG. Remove unnecessary quotes around xm_defines
	settings.
	(m68k-crds-unos*): Don't #define unos - tested nowhere.
	(m68k-apple-aux*): Don't #define AUX - tested nowhere.
	(alpha*-*-linux*ecoff*, powerpc-*-linux*libc1,
	powerpc-*-linux*): No need to set xm_defines - handled by
	global settings for *-*-linux*.

From-SVN: r41714

gcc/ChangeLog

 2001-04-30  Zack Weinberg  <zackw@stanford.edu>
 
+	* tsystem.h: Test only POSIX for availability of string.h 
+	and time.h.
+	* config.gcc (all systems): If USG appeared in xm_defines,
+	change it to POSIX.  If both USG and POSIX appeared, just
+	delete USG. Remove unnecessary quotes around xm_defines
+	settings.
+	(m68k-crds-unos*): Don't #define unos - tested nowhere.
+	(m68k-apple-aux*): Don't #define AUX - tested nowhere.
+	(alpha*-*-linux*ecoff*, powerpc-*-linux*libc1,
+	powerpc-*-linux*): No need to set xm_defines - handled by
+	global settings for *-*-linux*.
+
+2001-04-30  Zack Weinberg  <zackw@stanford.edu>
+
 	* dbxout.c, mips-tfile.c, config/mips/mips.c, xcoffout.c:
 	Always include gstab.h, not system stab.h.  Don't provide
 	default definitions of N_CATCH or N_OPT.  Always use the

gcc/tsystem.h

@@ -72,7 +72,7 @@ extern int atexit (void (*)(void));
 extern int errno;
 #endif
 
-#if defined(POSIX) || defined(USG)
+#ifdef POSIX
 #include <string.h>
 #endif
 
@@ -83,7 +83,7 @@ extern int errno;
 /* GCC supplies this header. */
 #include <limits.h>
 
-#if defined(POSIX) || defined(USG)
+#ifdef POSIX
 #include <time.h>
 #endif